You might want to use ProRes 422 instead of HQ, as the resolution of the GoPro is not really high enough to take advantage of ProRes HQ...you'll just get a larger file size with no discernible improvement.

You might also want to experiment with both "Better" and "Best" settings for resize. Better is much faster than Best for encoding, and is often indistinguishable In quality.

I thought I'd put my solution out here for anybody who is looking to actually increase their resolution in the video. Now, I understand it is impossible to increase the detail in a single frame, because data that does not exist cannot just appear magically and it is rather hard to synthesize accurately.

Here is my uprezzing technique. (It works about to about 2x resolution, and the actual detail resolution u get out of it may be between 1.3x and 1.5x)

Required Programs: Final Cut Studio 2 or 3, Neat Video Pro plugin ($99) for Final Cut (this may work with After Effects of Premiere, but I haven't tried on them)

This technique is for upconverting video and synthesizing it to a higher resolution using FCP, Compressor, and Neat Video's super-resolution temporal algorithms.